Pressure-reducing device.



No. 7U0,954. Patented May 27, |9032.

N. LOMBARD & J. 0. BANNING.

PRESSURE REDUCING DEVISE.

(Application led Apr. 21, 1900.)

(No Model.)

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Unrrhn ATENT OFFICE.

NATHANIEL LOMBARD AND .IOSEII-I O. BANNING, OF BOSTON, MASSACHU- SETTS, ASSIGNORS TO THE BOSTON CHEMICAL FIRE ENGINE MANUFAC- TURING COMPANY.

-PRESSURE'HREDUCIISC? DEVICE.

SPECIFICATION forming part of Letters Patent No. 700,954, dated May 27, 1902.

Application filed April 2l, 1900. Serial No. 13,788. (No model.)

To (o7/Z zii/wm it 71mg/ concern:

Be it known that we, NATHANIEL LOMBARD and JOSEPH O. BANNING, of Boston, in the county of Suolk and State of Massachusetts,

have invented certain new and useful Improvements in Pressure-Reducing Devices, of which the following is a specification.

This invention relates to mechanism for automatically reducing the pressure of a iluid 1o passing through a conduit, and has for its object to provide novel and simple and reliable means particularly useful for reducing the pressure of compressed air employed for impelling a hre-extinguishingluid, although we do not restrict ourselves to such use of the said mechanism.

Our invention consists in certain novel features of construction and arrangement, which we will now proceed to describe and claim.

2o In the accompanying drawing the ligure represents a sectional View ot' the principal parts of the device, other portions being represented in side elevation.

In carrying out our invention we provide a novel and simple form of reducing-valve for reducing the pressure of a duid, such as compressed air passing through the chambers of the valve in the direction indicated by the ar rows. Said valve has a casing 19, with inlet 3o and outlet chambers 2O 2l, separated by a partition 22, which has a seat for a valve 23. Ve prefer to make the valve 23 separate from its actuating-stem, so as to permit it to act as a check-valve, which will close if for any reason the pressure in chamber 21 exceeds the pressure in chamber 20.

Attached to the casing 19 is a rigid yoke or frame 24, which forms an outer abutment for an expansible chamber 25, consisting of two .'10 plates 2G 27, having a tight joint at their edges secured by rivets 2S or other suitable devices. The plate 2G is shown as attached by a screw-stem 29 to the frame or yoke 24, while the, plate 27 is connected to a stem 3l,

A5 which extends through a stuffing box or gland 32 into the interior of the casing 1) and has its end located within the outlet-chamber 21 in proximity to the valve 23. The pressure of the outlet-chamber 21 is brought to the in- 5o terior of the expansible chamber 25 by means of a duct 33, traversing the stem 3l.. The

spring of the plates 26 27 is such as to normally retract stem 31 from the valve 23; but when the outlet-chamber or terminal pressure becomes sufficient to overcome the force of the spring action said stem 3l will be forced inwardly and will cause the valve 23 to close against its seat. To adjust or vary the closing-pressure of the valve, we make the frame or yoke 24` adjustable, this being done, as 6o shown in the drawings, by threading a stem 34 on apart of the valve-casing 19 and correspondingly threading the lower part or collar 35`of the yoke 24. By turning the yoke the eXpansible chamber25 and stem 3l will there- 65 by beV moved bodily inwardly or outwardly.

1. A pressuremeducing device comprising a casing having inlet and outlet chambers connected by a passage, a valve controlling 7o said passage, an expansion-chamber external to the casing, a stem interposed between said chamber and the valve, and passing through the wall of the casing, a duct traversing said stem and connecting the interior of the eX- pansion-chamber With the outlet-chamber, whereby the pressure in the expansion-chamber is controlled by that in the outlet-chamber, and means to bodily adjust said expansion-chamber axially of said stern.

2. A pressure-reducing device comprising a casing having a valve-seat located between inlet and outlet chambers, a valve operating in connection with said seat, a stem for operating said valve,said stem being separate from the valve, an expansion-chamber with separable walls controlling said stem and adapted to close the valve by the separation of said Walls, a yoke or frame connected with the casing and forming an outer abutment for 9o said chamber being detachably secured to said chamber, and means to bring the pressure of the outlet-chamber to the interior of said eX- pansion-chamber.

3. A pressure-reducing device comprising a casing having a valve-seatlocatedbetween inlet and outlet chambers, a valve operating in connection with said seat, astemfor operating said valve, said stem being separate from the valve, an expansion-chamber con- Ioo sisting of two plates connected at their edges and one of said plates connected to the stem,

the said plates having a springiness normally moving them together, the separation of said plates causing the valve to close, a yoke connected with the casing and attached to the Outer plate, and means to bring the pressure of the outlet-chamber to the interior of saidv expansion-chamber.

l 4. A pressure-reducing device comprising.

sion-chamber is controlled by that in the outlet-chamber.

5. A pressure-reducing device comprising a casing having a valve-seat located between inlet and outlet chambers, a valve operating in connection with said seat, a stem for operating said valve, an expansion-chamber with separable walls 'controlling said stem, a yoke or frame connected with the casing and forming an outer abutment for said chamber, means to bring Ithe pressure of the outletchamber to the interior of said expansionchamber, and means to adjust said yoke on the casing.

In testimony whereof we have affixed our signatures vin presence of two witnesses.

NATHANIEL LOMBARD. JOSEPH O. BANNING. Witnesses:

R. M. PIERsoN, M. B. MAY. 

